大跨双层屋盖结构风洞试验与风振响应研究

对南太湖湿地奥体公园复杂体型体育场双层屋盖结构进行了风荷载的风洞试验与风致动力响应研究。屋盖由高低两个开口椭圆屋面叠合而成,两屋面之间设置观光走廊。利用风洞模型试验测定了双层屋盖上下表面的平均和脉动风压时程数据。通过计算分析得到了屋盖结构局部测点的极值风压以及平均风荷载整体合力与最不利风向角。然后基于有限元方法对该屋盖进行了风振响应的动力时程分析,获得了结构风振系数、等效静力风荷载的分布图以及考虑风振效应的最不利风向等数据和结论。

Study on wind-induced dynamic responses and wind tunnel test for a large-span double-layered roof structure

Wind tunnel test and wind-induced dynamic response analysis were carried out for a complex-shaped large-span double-layered stadium roof structure localed at the Nantai Lake Olympic Wetland Park.The roof is composed of two curved layers at different height levels between which an observation corridor is arranged.The mean and fluctuating wind pressures on the upper and lower surface of the roof were first measured through the wind tunnel model test.The peak pressure at local points and the global wind loads of the roof including the most unfavorable wind direction angles are analyzed and determined.A dynamic time history analysis based on the finite element procedure is then performed to predict the wind-induced dynamic responses of the roof.The diagrams of wind vibration coefficient and equivalent static wind load distributions,and the most unfavorable wind directions considering the vibration effect of the roof are analyzed and presented.